According to economists, in the 1980s and 1990s, immigration of low-skilled workers may have increased the labor supply of highly skilled women, and immigration of highly skilled workers may have increased the rate of innovation in the United States.

The Economic Lowdown Podcast Series, Volume 1, Episode 10, by Scott Wolla.
In Episode 10, young people who are looking for that first job can learn about the basics of the labor market in this country. A brief explanation is given of the roles played by education, supply, demand, productivity and government regulation.